Bitcoins worth £18,500 ($24,000) that were sent to hacker group the Shadow Brokers have been moved. The funds were received during an auction of hacking tools that failed to attract much interest before the group eventually released the tools for free. One leak included an exploit that helped the WannaCry ransomware to spread around the world. Read more

One of the biggest Bitcoin currency exchanges has been taken offline after 24,000 units ($250,000; £157,800) of the virtual currency were stolen from its computer servers. Bitcoins can be used for online money transfers and trades, and the currency uses cryptography to protect it. Unlike other currencies, Bitcoins are not issued by a central bank or other centralised authority. Instead they are created in a process called "mining", in which coins are issued to a user when they solve a complicated mathematical problem using their computer.Read more